JAVA 平行體面積計算

[code]
import java.io.*;

public class Jamie02 {
/**
* @param args
*/
public static void main(String[] args) throws IOException {

System.out.println(“選擇形狀”);
System.out.print(“1.三角形 2.長方形 3.圓形= “);
BufferedReader br = new
BufferedReader(new InputStreamReader(System.in));
String str = br.readLine();
int C = Integer.parseInt(str);
if (C>=4){
System.out.println(“輸入錯誤重新啟動”);
}

if (C== 0){
System.out.println(“輸入錯誤請重新啟動!!”);
}

if (C==1){
System.out.println(“請問底為幾公分? “);
String qwe = br.readLine();
double D = Double.parseDouble(qwe);
System.out.println(“請問高為幾公分? “);
String ASD = br.readLine();
double A = Double.parseDouble(ASD);
System.out.print(“三角形面積為=”+D*A/2);
}

if (C==2){
System.out.println(“請問長為幾公分?”);
String qwe = br.readLine();
double D = Double.parseDouble(qwe);
System.out.println(“請問寬為幾公分?”);
String ASD = br.readLine();
double a = Double.parseDouble(ASD);
System.out.print(“長方型面積為=”+D*a);
}

if (C==3){
System.out.println(“請問半徑為幾公分?”);
String qwe = br.readLine();
double D = Double.parseDouble(qwe);
System.out.print(“圓形面積為=”+D*D*3.14);
}
}
}

[/code]